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Two Loci Exert Major Effects on Chlorogenic Acid Synthesis in Maize Silks

^a Genetics Area Program, Univ. of Missouri-Columbia, Columbia, MO 65211
^b Biological Sciences Unit, Univ. of Missouri-Columbia, Columbia, MO 65211
^c Richard B. Russell Research Center, Univ. of Georgia, Athens, GA 31793
^d USDA-ARS National Center for Agricultural Utilization Research, Peoria, IL 61604
^e USDA-ARS, Plant Genetics Research Unit, and Plant Science Unit, Univ. of Missouri, Columbia, MO 65211

View larger version (20K): [in a new window]   Fig. 1. The general phenylpropanoid biochemical pathway and proposed steps leading to CGA. Enzymes are in black caps and genes in italics. PAL, phenylalanine ammonia lyase, C4H, cinnamate-4-hydroxylase; C3H, coumarate-3-hydroxylase; 4CL, 4-coumaroylCoA ligase; CQT, coumaroylCoA:quinate hydroxycinnamoyl transferase; CHS, chalcone synthase. This sequence of events is based on preferred substrates and time-course studies in other plants, and branchpoints into lignin and flavonoid biosynthesis are shown.

View larger version (32K): [in a new window]   Fig. 2. Distribution of CGA and flavone values from individuals of A: (A619 x Mp708)F2, B: (A619 x Mo6)F2, and C: (Mo6 x Mp708)F2 populations. The percent fresh silk weight of each chemical (CGA or flavones) was measured with reverse-phase HPLC. Parental and F1 values are shown for each population, and represent the means of 5-15 individuals.

View larger version (36K): [in a new window]   Fig. 3. Genotype class means for CGA and flavones at the marker genotype nearest the qtl2 locus in A: (A619 x Mp708)F2 and B: (A619 x Mo6)F2 populations. Genotype A, homozygous A619 alleles; H, heterozygous; and B, homozygous Mp708 or Mo6 alleles depending upon the population. Standard error bars are taken to the second standard deviation.

View larger version (38K): [in a new window]   Fig. 4. Genotype class means for CGA and flavones of markers nearest to p1 and qtl2 from A: (A619 x Mp708)F2 and B: (A619 x Mo6)F2 populations. Genotypes of p1 are represented by the bottom row of letters, and subdivided into qtl2 genotypes where A, homozygous A619 alleles; H, heterozygous alleles; and B, homozygous Mp708 or Mo6 alleles dependent upon the population. Standard error bars are taken to the second standard deviation.